Performance of ceramic composite separators in lithium nickel cobalt manganese oxide/graphite lithium-ion batteries

doi:10.12028/j.issn.2095-4239.2019.0043

Abstract

Abstract: Ceramic composite separators are used widely in the feld of power lithium-ion battery and have a direct effect on electrical performance. Six kinds of commercialized polyethylene terephthalate (PET)/ceramic and polyolefin/ceramic composite separator are selected and their corresponding morphology, contact angle, air permeability and electrolyte uptake are investigated. Lithium nickel cobalt manganese oxide/graphite pouch cell of 2 A·h were fabricated with these ceramic composite separators. And the resistance, capacity, self-discharge, AC impedance, rate capability, cycle life and high-temperature float charge performance are characterized. Due to the small and uniform size (0.2~0.5 μm) of coated ceramic particles, high electrolyte uptake (2.0 mg·cm^-2), low air permeability[72 s·(100 mL)^-1] and resistance (4.65 mΩ) for 2# PET/ceramic separator, the prepared lithiumion battery exhibits best comprehensive performance with excellent rate capability of 94.9% capacity retention from 1C to 10C, outstanding cycle life of 102% capacity retention after 500 cycles at 5C and high capacity retention of 90.4% for the floating charge at 65℃ after 1000 h.

Key words: ceramic composite separator, lithium-ion battery, high-temperature float charge, rate capability, cycle performance

CLC Number:

TM912.9

WU Mingxia, YANG Chongyang, ZHANG Qinglin, CHEN Si, AN Zhongxun, ZHOU Yirong. Performance of ceramic composite separators in lithium nickel cobalt manganese oxide/graphite lithium-ion batteries[J]. Energy Storage Science and Technology, 2019, 8(4): 725-731.

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